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            <h1 style="display: none">用Flex构造简易C语言词法分析器</h1>
            
            <div class="markdown-body" id="post-body">
              <p><strong>Flex构造C语言词法分析器</strong> 可以识别大部分的C语言关键字和标识符，可以去除注释（多行单行都可以），可以识别整数和浮点数，可以识别错误的浮点数。</p>
<p>lex文件结构：</p>
<div class="hljs"><pre><code class="hljs cpp"> [第一部分：定义段]
<span class="hljs-comment">/*</span>
<span class="hljs-comment"> *按照C语言语法，声明文件包含，宏定义，常数定义，全局变量及外部变量定义，函数声明等</span>
<span class="hljs-comment"> */</span>
 %%
 第二部分：词法规则段
  <span class="hljs-comment">/*</span>
<span class="hljs-comment"> *核心部分，正则定义和状态定义（解释见后）</span>
<span class="hljs-comment"> */</span>
 %%
 第三部分：辅助函数段]
  <span class="hljs-comment">/*</span>
<span class="hljs-comment"> * 辅助函数段用C语言语法来写，辅助函数一般是在词法规则段中用到的函数。这一部分一般会被直接拷贝到lex.yy.c中。</span>
<span class="hljs-comment"> */</span></code></pre></div>
<p>状态定义：</p>
<div class="hljs"><pre><code class="hljs c"><span class="hljs-string">&quot;//&quot;</span>.* &#123;&#125;
<span class="hljs-string">&quot;/*&quot;</span> &#123;BEGIN COMMENT;&#125;
&lt;COMMENT&gt;<span class="hljs-string">&quot;*/&quot;</span> &#123;BEGIN INITIAL;&#125;
&lt;COMMENT&gt;. &#123;&#125;</code></pre></div>
<p>这一部分是根据不同的状态使用不同的规则，比如要识别多行注释，则添加BEGIN COMMENT即可转移到&lt; COMMENT &gt;状态。</p>
<p>代码如下：</p>
<div class="hljs"><pre><code class="hljs cpp">在这里插入代码片<span class="hljs-comment">/*</span>
<span class="hljs-comment"> *t2.lex 词法分析器</span>
<span class="hljs-comment"> *班级：计科1604</span>
<span class="hljs-comment"> *学号：1030416414</span>
<span class="hljs-comment"> *姓名：wyc（ORION233）</span>
<span class="hljs-comment"> *时间：2018-11-4</span>
<span class="hljs-comment"> */</span>
%option pointer
%option noyywrap
%x COMMENT
%&#123;
	<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;stdio.h&gt;</span></span>
	<span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;string.h&gt;</span></span>
	<span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> MAXLEN 100</span>
	<span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> MAXTYPE 10</span>
	<span class="hljs-meta">#<span class="hljs-meta-keyword">define</span> MAXSTR 15</span>

	<span class="hljs-keyword">char</span> *a[MAXTYPE] = &#123;<span class="hljs-string">&quot;type&quot;</span>,<span class="hljs-string">&quot;for&quot;</span>,<span class="hljs-string">&quot;integer&quot;</span>,<span class="hljs-string">&quot;decimal&quot;</span>,<span class="hljs-string">&quot;identify&quot;</span>,<span class="hljs-string">&quot;bracket&quot;</span>,<span class="hljs-string">&quot;QUOTE&quot;</span>,<span class="hljs-string">&quot;OPT&quot;</span>,<span class="hljs-string">&quot;float&quot;</span>&#125;;
	<span class="hljs-class"><span class="hljs-keyword">struct</span> &#123;</span>
		<span class="hljs-keyword">int</span> line;	<span class="hljs-comment">//store line numbers</span>
		<span class="hljs-keyword">int</span> id;		<span class="hljs-comment">// store tag</span>
		<span class="hljs-keyword">char</span> text[MAXSTR];	<span class="hljs-comment">//store yytext</span>
	&#125;tag[MAXLEN];	<span class="hljs-comment">//store tags</span>
	<span class="hljs-keyword">int</span> flag = <span class="hljs-number">0</span>;	<span class="hljs-comment">//error flag</span>
	<span class="hljs-keyword">int</span> cnt = <span class="hljs-number">0</span>;	<span class="hljs-comment">//array notation counter</span>
    <span class="hljs-keyword">int</span> line=<span class="hljs-number">1</span>;		<span class="hljs-comment">//line counter</span>
%&#125;
DIGIT [<span class="hljs-number">0</span><span class="hljs-number">-9</span>]
OINTEGER [<span class="hljs-number">1</span><span class="hljs-number">-9</span>]&#123;DIGIT&#125;*
INTEGER (<span class="hljs-string">&quot;+&quot;</span>|<span class="hljs-string">&quot;-&quot;</span>)?&#123;OINTEGER&#125;
DECIMAL &#123;INTEGER&#125;(.&#123;OINTEGER&#125;)?
LETTER [a-zA-Z]
ID (&#123;LETTER&#125;|_)(&#123;LETTER&#125;|_|&#123;DIGIT&#125;)*
OPT (<span class="hljs-string">&quot;+=&quot;</span>|<span class="hljs-string">&quot;-=&quot;</span>|<span class="hljs-string">&quot;*=&quot;</span>|<span class="hljs-string">&quot;/=&quot;</span>|<span class="hljs-string">&quot;+&quot;</span>|<span class="hljs-string">&quot;-&quot;</span>|<span class="hljs-string">&quot;*&quot;</span>|<span class="hljs-string">&quot;/&quot;</span>|<span class="hljs-string">&quot;&lt;=&quot;</span>|<span class="hljs-string">&quot;&gt;=&quot;</span>|<span class="hljs-string">&quot;==&quot;</span>|<span class="hljs-string">&quot;=&quot;</span>)
INDEX &#123;DIGIT&#125;+(\.&#123;DIGIT&#125;+)?e([+-])?&#123;DIGIT&#125;+
ERROR &#123;DIGIT&#125;+(\.&#123;DIGIT&#125;+)?e

%%
<span class="hljs-string">&quot;//&quot;</span>.* &#123;&#125;
<span class="hljs-string">&quot;/*&quot;</span> &#123;BEGIN COMMENT;&#125;
&lt;COMMENT&gt;<span class="hljs-string">&quot;*/&quot;</span> &#123;BEGIN INITIAL;&#125;
&lt;COMMENT&gt;. &#123;&#125;

\n &#123;++line;&#125;
(<span class="hljs-keyword">int</span>|<span class="hljs-keyword">float</span>|<span class="hljs-keyword">double</span>|<span class="hljs-keyword">short</span>) &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">0</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); <span class="hljs-comment">//has bugs--use strcpy is ok,no pointer </span>
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
<span class="hljs-keyword">for</span> &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">1</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,<span class="hljs-string">&quot;&quot;</span>); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
&#123;INTEGER&#125; &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">2</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
&#123;DECIMAL&#125; &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">3</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
&#123;ID&#125; &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">4</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
(<span class="hljs-string">&quot;(&quot;</span>|<span class="hljs-string">&quot;)&quot;</span>|<span class="hljs-string">&quot;&#123;&quot;</span>|<span class="hljs-string">&quot;&#125;&quot;</span>|<span class="hljs-string">&quot;[&quot;</span>|<span class="hljs-string">&quot;]&quot;</span>) &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">5</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
<span class="hljs-string">&quot;\&quot;&quot;</span> &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">6</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,<span class="hljs-string">&quot;&quot;</span>); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
&#123;OPT&#125; &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">7</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
&#123;INDEX&#125; &#123;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">8</span>;
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	<span class="hljs-comment">//printf(&quot;%s : %d--%d\n&quot;,tag[cnt].text,yyleng,cnt);</span>
	cnt++;
&#125;
&#123;ERROR&#125; &#123;
	flag = <span class="hljs-number">1</span>;
	tag[cnt].line = line;
	tag[cnt].id = <span class="hljs-number">-1</span>;	<span class="hljs-comment">//soso</span>
	<span class="hljs-built_in">strcpy</span>(tag[cnt].text,yytext); 
	cnt++;
&#125;
. &#123;&#125;

%%

<span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">()</span></span>
<span class="hljs-function"></span>&#123;
	<span class="hljs-comment">/*</span>
<span class="hljs-comment">	 *begin lexical analysis</span>
<span class="hljs-comment">	 *present all the tags</span>
<span class="hljs-comment">	 *but ...</span>
<span class="hljs-comment">	 */</span>
	yylex();

	<span class="hljs-keyword">if</span>(flag) &#123;<span class="hljs-comment">//print ERRORS</span>
		<span class="hljs-keyword">int</span> i;
		<span class="hljs-keyword">for</span>(i=<span class="hljs-number">0</span>;i&lt;cnt;i++)&#123;
			<span class="hljs-keyword">if</span>(tag[i].id == <span class="hljs-number">-1</span>)&#123;
				<span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;Error type A at Line %d: Illegal floating point number \&quot;%s\&quot;.\n&quot;</span>,tag[i].line,tag[i].text);
				<span class="hljs-keyword">break</span>;
			&#125;
		&#125;
		
	&#125; <span class="hljs-keyword">else</span> &#123;
		<span class="hljs-keyword">int</span> i;
		<span class="hljs-keyword">for</span>(i=<span class="hljs-number">0</span>;i&lt;cnt;i++)&#123;
			<span class="hljs-keyword">if</span>(tag[i].id == <span class="hljs-number">5</span>)&#123;<span class="hljs-comment">//print &quot;QUOTE&quot;</span>
				<span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;line%d:(%s, \&quot;%s\&quot;)\n&quot;</span>,tag[i].line,a[tag[i].id],tag[i].text);
			&#125; <span class="hljs-keyword">else</span> &#123;
				<span class="hljs-built_in">printf</span>(<span class="hljs-string">&quot;line%d:(%s, %s)\n&quot;</span>,tag[i].line,a[tag[i].id],tag[i].text);
			&#125;
		&#125;
	&#125;
	
	<span class="hljs-keyword">return</span> <span class="hljs-number">0</span>;
&#125;


</code></pre></div>

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